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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4695538c46febc1652d909307c42dff0305ecdca3ffce13d75ab4f20f4ce37c9' 
  AND token = 'A2usXaVlFG+QzaKK+LcSMgk3AGEIQiZvwOl8a2piBtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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