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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a174bd97af3867f19613ff8ef712afb0b698babaf3c83d74482968af72c6255f' 
  AND token = 'YJyNtiMkCIs5acebl58iJtPDeHCrYxx5sXCmfgeiHg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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