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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6692f47529470388ac86c35069621563378f821d08a8c710e707661c6ba16b30' 
  AND token = 'fla5vqT8qyUPd2GVwzFOxQPKiBicURQ+Oz9yzVoepvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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