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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7accad1f7c66ae3647fb67cc5c446158cc91e5d3422fd27f961a7450649bdf' 
  AND token = '3i3bhasIjBQTvrfRALMNGjr5/aYv+NUYY+73WCdSyEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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