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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0498684cf4a498abea1daf00cacdba76b71f65e831f80ecfcdac67b1f0516e6' 
  AND token = 'F8RyiKtHu50pbdplOXn0a2P2c64GQi4phIjkl7/OKuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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