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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df86adf311d7918da80f7ff70f8e789901d5826046b4b9c3416ca10136f91e34' 
  AND token = 'No/b1iLxnm2Dx5KplFlsZgAITwdXGNTcUPD2t8nic6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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