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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8176925a2a04e75f1e4d0e0e19322b7db712dfbae02147763dbc5e319b78f194' 
  AND token = 'vOKZU3A9RdiTjyXjobN4z7Wl0lhtFYmckzKM3kX9JHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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