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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f1540ea0be362475e9e819c9c21ef0aa3a4004d5d4dd5372f07ca74d8bd87d' 
  AND token = 'xli44rcYRGFn065bw7at5rJl0xojQ9iFj8tut4Ulm24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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