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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f3f1622c4c9ff77753c55641b5ffa1541da27bb45de8afa67b05058d65c3b3' 
  AND token = 'bxB6xvU27oWjQSGiKtYU8A6hlySCMlj1Ak1N6Ee/HgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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