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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a129e6799dc04f9d6e8120cf629b3881b108e1c4ea793d3ade75b2593fc2ed0' 
  AND token = '9fgXUWW4x/mLOslNRUMToX8mvAvI7xHkdUy/FMv2jdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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