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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd61bd383decb6516a3f1baecdc2a3460a4ff2e4bd60535a8f14635f04cee79' 
  AND token = 'rfRAHy5Zq0cjmNINQ0aBppUqsx6YZHKVuF/tvIBMVkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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