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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05fbbcdc79ac9a41862b1e67485dfd410d6154173d4b2f496d1ce474bd48fac' 
  AND token = 'pKdaktj0s/kGmvkp7YDNo2wJrpezkAxTjbIFyTo608Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}