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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55df241ef9f579524bdf442f33cda867e5d7c91616078f2a648f487b860f5c04' 
  AND token = '41YHNy/G1aj5ygw9BEXhP1HAJpbeKbTKT0dQU+Md98Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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