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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c7c97cc5a4e112dc41c31f16fd375c85669ac9b351b125728a6e88a7c938f2' 
  AND token = '53rCzsa3qllLSP4eLHmg1wnQ219DGZ/7vD9dzdmH48Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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