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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dd19a3159f463fdd25eb3b7c822e4c6918be80bb30a11aea3d1a746ca86f01' 
  AND token = 'bMRJHqLQ8QjbYvJ/Nqjpzdd0Hj1W/C+8q/LYTaHJzoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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