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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb320672c6d68a9cc4b5e7be2e5d8a7493b519bc3222e795813f6956b42bb9b' 
  AND token = 'PqxNDfePT1JQoglJeNy/1u545EhBSv5gAQrAFeqg/ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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