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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dff87e513dd652123f8aac471c0b740b2f448fb364892b97b147cae63cc024' 
  AND token = 'CI+OhA7wTOyVFD+wEWqMxkIcCf5q7QkooxD2C/d8r8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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