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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7353a70f3cd6b08b58f732b06922ea91e3436671cbff9681277f01a5adb36569' 
  AND token = 'rkQ7c34EOfo15i77TWZ29ji9twx+7IGm0aa4fPYvmdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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