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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7581445a53ec40dcd71c816d25d4c3b1e497b10cd5c7056378b254fc04a06b' 
  AND token = '9ka4UMVBtWK4BkwGShZU+uQ5QIUvxaYnPBydnyLlSN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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