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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a9468753026b51d691fae303104f430309f9f8feafcb32a1043f1aa45ab4cf' 
  AND token = 'CnoryPmEC+q2JdKt/di6Dl5kjloPo08n1pYZsc0VTpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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