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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f61901bb1e8b00607cc30cbbbeccb768fb5c9cc5f1955754743a0cd9fb23faa9' 
  AND token = 'nrP/Cz+rBDuD7mt25F5Q9KODs73Xmk8VXi7nQ1+lTo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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