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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebfa388af2f32bb19ff61f7a84076738e91b8ca527f8cb88af14ac10a454477' 
  AND token = 'NWeppq4cEsubp3KMRTKjw5jpcTj3hnLBSnJwwxJbt/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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