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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ea546c1ba948745c5d5134047abcf388092acea45b3382cb54b072ac5ede24' 
  AND token = 'mJEI6Qc348fYInOnyXYLsIPI+jI/das9M52z+VjV3/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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