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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414e322a0f9edf19e75b63eac63f43c2751e9275aa9c445a2dd6f5537c2139ab' 
  AND token = 'TrQv1luXFJWsrVJtvqzJqOnMTOa0NB2ZTX6CZ86tKwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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