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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99164260421015cc11d2f57f0f7ce95dc0a10a7fcb674ffe49cec1868783c9e' 
  AND token = '/aAl68SsQzm2FW2tN6a8K1jJPHyvit1LhbuUPlsBRjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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