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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6077e60458ad87d9af3591e147d9ad59aea3f6dd0a2891d38ba595c347efbb' 
  AND token = '1DmjOuTbcva9vwZA4AgoqnIGgge2RNVQtqenREGnRhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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