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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae24c8fa2c3d495b60d88d60611a1f36498daedcf00a5b51b85d241963485b45' 
  AND token = 'NtE88dt9ijlbLTJYnLVLpp2UIJr9ovjvpaKR/HlrqnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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