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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ca5e7612f4095c58850f2bba920c435af7d1ea2c03b38738b377c32a0223df' 
  AND token = 'oVWWvRWKZ39tNemn/Vg2POuRNv3NA/kpA5lF3BRTizA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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