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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c793c923a8e1816a76b7e3696247e08201640ccfe336dd0cb2f468159ffcdf' 
  AND token = 'A1h6h4y03Y4CjSEeA0op1/SlcyviLhqRV1pJU3o0ygs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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