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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627c8f786ba707fc744b7760e092f718286492de8ce3556b18e3f3911c3a54cc' 
  AND token = '/y0MMIukkijzCfolP3fHLXSLgP9Yo42mRnt65xQKCyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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