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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3115e403c8ff89f13ecc23af4dc42b15964991e1c54b55993653cf2fa06e6c1c' 
  AND token = '8dgQtbFgNtKFVNuOZJSy4zq3iXo4K30zBIDRgixZ9rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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