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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26527d707e00f4dabb51b4b71de23acf0795bbba8d9596a9c6d14f5e2ea4b80e' 
  AND token = '/hPGI3WnXbPrmyelb3jpelSL7XR8MfQHXyOCv5UNhgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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