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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4f626752a0195d75bf342cddbdbe6e66318f5998c860390bd3bb055d1f3cf0' 
  AND token = 'icRePmGUrETx9hMokEaKRpSP2J+HtK6lWLUSBk9cZ6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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