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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e21763d458a0bcab56a7344a0c59394a79f6af1ae64d8524536c1ee8ceef726' 
  AND token = 'WCAw1qj9dJOftuIQxWR5vpnCquszUzVv6vyKvau1l7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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