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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d439bc77200b8608d70e1fd69b15c32c85a9ef92925aa4fd5826a720e11bd3c' 
  AND token = 'e8lbzLt389HCyEWKNEuYa7yYL9S7Eq+tfIAbJl9rARA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00174

JSON explain

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