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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ccd58a56d86fe1226be6e6ec691eb71bf3df650edae1bf08daff5377241554d' 
  AND token = 'qZGfosT+1lWffPEn8JvKR72t4dX076qH/8cHwXxDurk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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