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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da551e9731341db4d1e444542f993306e930e437b332460bb9bd2c7affdcd7c' 
  AND token = 'OzgcO9r1zAS0Z7IRDg3CmgY3dxXyrCnngt2birTHRUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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