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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99cd3f79f32091b385b049805ca67e5db11b6b34c830dd590609babcc79145f' 
  AND token = '60iYd0uxFm32m/2IFGAZRU8GE1lAhMNVJe13sVfVswQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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