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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '592c6dbb903ee609fdf3b769d1e20e0517c66b07992e76b473e57ad606fe76ed' 
  AND token = 'DKkLF9sgX6RfQL4EjsEi7QFyul1yq/xSa+2SHAvmiJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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