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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd733890a7d3af1f6537c7fc34ad99d19488df3ebf9609e7fe1d36f85f9511d33' 
  AND token = 'yDQWNeqVbZ+iESQ0Ugv9CePE5ocO8lRiMyNFIo4gBKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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