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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690db26efe25c86ea5c9616a04fce91f3a5f5ee50d4a32822cd392729ab0f1f9' 
  AND token = '375XqkQaYtdEMrzsN5kLfrdElkU4bVvibgTfiwfumjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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