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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b8d04b6b66d772a4432dde26d4d90f5b0353755e278ccae62b061c99d7a83c' 
  AND token = '8VPIWsJlGdYIRokoeEjHFtJfne/nVoQ9fXSRfexBpfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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