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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914e4114b187bda197342ee3526b81c225b0eca2d3563fc215ae4633cbe32a64' 
  AND token = 'E08Mp/Yiq/D8n2eA7XaLsn+BzoT4ITPVH2sXguf1OC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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