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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ee79ae43032077400029e37feb3ed2c27ce601e8058252a2671a9d05ea12ac' 
  AND token = '+EyT7kKOhqeUq86IMRBynn6oZBWT8yKVphfx9B9I5ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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