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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb2dcfd225810bc1afbc961378b46fdf91c316be37da61d9c12e13c2a3e46b9' 
  AND token = 'eaKObs4Vat0n3h5dzvUFfyHm0zDlRu7fE3h50AGRHnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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