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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1a06a760c5d011caae5282314459b8e433c5eb6b86c726a81f6c2a3cf655e7' 
  AND token = '6xjTOPLTgau2YLa5lZewVsBOaYRTp5+AdX8VNvXXM/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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