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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949b9254241d68453ae9c57c17dc672f256a883e07f0caf93a115883d20039d4' 
  AND token = 'HwxdYXixXsrWGMSCFfjHsLBxJS9ccZ4w45CT+kfYBp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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