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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd68c079b4f277260ba3e5041359e5f987d24ecf3f23fd9d1c225864e355619' 
  AND token = 'ErcFLSYNpXBy2NYk6g94T+7ngQym06xbsf9Mxwsaq8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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