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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c420c59ea52e9ecc183b0088a560031c49dfebcca13ba4dc1035e2ec5ab7de0' 
  AND token = 'aPP7+Y6agVvdUttzp98qlB9eC+sIynko4WIf+SyS1vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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