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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbc1354725695811827c93baa947ab9cc9bf41147824c1e9d951c2d77e7b7e5' 
  AND token = '31dXyBoYb6+ucQsqh4OZPDCZ4ZdXcJ1sOX3QtphZDAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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