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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0bc87694b0f43f8135a0348886730c5d8f27cf02fcfe388f59d2584692295d2' 
  AND token = 'XkV5stX7ZTcQKQ0oQIsK5gahfwueoj4Z7YICfC0CUMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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