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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831f3729c0bdf1cc61e5e284fd88bde43d0eb4a853b70874b2db94ab47a57eff' 
  AND token = '/qlKW87QeMJknVCzIhSfWNFIAJFUa82KXanNy1dpr1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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