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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bfbd9868575017f475adafc7d9d1b0241ef97442958bab160b7ce01ead3772' 
  AND token = 'fOL+TRArF8+6GQQA1BGtCRTvbagMawZ1JeEuHO93RcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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