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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83283c6bd401a05fff029ab07b3015ceeca82f9d0b2254b96339285124f5cc66' 
  AND token = 'WnCVG9cX9mal/wnD5ekAgttU7YwmgEldNAeKde7YmJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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