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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8731bae8f4de109981d321968d920bc0eef1e90336b9c53c797a9b361ff57a8' 
  AND token = 'Jb2L2FjngTD5MZDo8WaePWoh2lXeVwd4dglwridCMvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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