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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c761612844da781525b1c7c1430d99c8f1b4e1dd85950538df2854074cd0fc' 
  AND token = '/R3uPUGwKPOx/gHs1bAwb4QLreewImiOh0P0YQBq9IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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