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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e590ae08955d578b822630ac28e29e9b84e5ab37ce3344315911aab66ca4a05d' 
  AND token = 'v4M6nIcNMuPZEPO1QedlceQ+Efs8nIiZhn95oxP594Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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